This may be a dumb question but does fish poo hang out the rectum for awhile or does my fish have worms, I have one Oscar who daily has a string like figure hanging from rectum, it will fall of but a day or two later its back

It is normal for poop to hang there for a while, what color is it?

if it is white and stringy its a sure sign of internal parasite/ increased flagelites in the blood ....especially if your fish has stopped eating .....we need more info first but looks like you will be using jungles anti internal parasite clear/metronidiazole and praziquantel

its kinda of gray looking

if its internal parasite it will turn white/clear and the fish will stop eating .....watch it closely and if this happens treat immediately in acordance with manufacturors directions with jungles anti internal parasite

he's been eating fine but i'll keep close eye on him, I'll probably pick it up anyway to be on the safe side thanks oh yeah is it contagious

please keep us posted for any development. good luck...
hope you can resolve it soon.

it is contageous